A 2 cubic meter tent has a surface area on the order of 10 square meter. The temperature differential can easily exceed 10 kelvin during a cold night, else your face will freeze off.
So the potential for the application you cite is whole watts of power, enough to recharge a phone or a lantern overnight. (though, at current silicon fabrication costs, the price would be prohibitive)
So the potential for the application you cite is whole watts of power, enough to recharge a phone or a lantern overnight. (though, at current silicon fabrication costs, the price would be prohibitive)